text: /* ----------------------------------------------------------------------------
   * Copyright (c) Huawei Technologies Co., Ltd. 2013-2020. All rights reserved.
   * Description: Semaphore file
   * Author: Huawei LiteOS Team
   * Create: 2013-01-01
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * 1. Redistributions of source code must retain the above copyright notice, this list of
   * conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice, this list
   * of conditions and the following disclaimer in the documentation and/or other materials
   * provided with the distribution.
   * 3. Neither the name of the copyright holder nor the names of its contributors may be used
   * to endorse or promote products derived from this software without specific prior written
   * permission.
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * --------------------------------------------------------------------------- */
  
  #include "semaphore.h"
  #include "limits.h"
  #include "sys/types.h"
  #include "errno.h"
  #include "map_error.h"
  #include "los_sem_pri.h"
  #include "time_pri.h"
  #include "los_sys.h"
  
  #ifdef __cplusplus
  #if __cplusplus
  extern "C" {
  #endif /* __cplusplus */
  #endif /* __cplusplus */
  
  static inline unsigned int SemaphoreGetId(const sem_t *sem)
  {
      return ((LosSemCB *)(sem->sem))->semId;
  }
  static inline unsigned short SemaphoreGetCount(const sem_t *sem)
  {
      return ((LosSemCB *)(sem->sem))->semCount;
  }
  /* Initialize semaphore to value, shared is not supported in Huawei LiteOS. */
  int sem_init(sem_t *sem, int shared, unsigned int value)
  {
      UINT32 semHandle = 0;
      UINT32 ret;
  
      (VOID)shared;
      if ((sem == NULL) || (value > SEM_VALUE_MAX)) {
          errno = EINVAL;
          return -1;
      }
  
      ret = LOS_SemCreate(value, &semHandle);
      if (map_errno(ret) != ENOERR) {
          return -1;
      }
  
      sem->sem = GET_SEM(semHandle);
  
      return 0;
  }
  
  int sem_destroy(sem_t *sem)
  {
      UINT32 ret;
  
      if ((sem == NULL) || (sem->sem == NULL)) {
          errno = EINVAL;
          return -1;
      }
  
      ret = LOS_SemDelete(SemaphoreGetId(sem));
      if (map_errno(ret) != ENOERR) {
          return -1;
      }
      return 0;
  }
  
  int sem_wait(sem_t *sem)
  {
      UINT32 ret;
  
      if ((sem == NULL) || (sem->sem == NULL)) {
          errno = EINVAL;
          return -1;
      }
  
      ret = LOS_SemPend(SemaphoreGetId(sem), LOS_WAIT_FOREVER);
      if (map_errno(ret) == ENOERR) {
          return 0;
      } else {
          return -1;
      }
  }
  
  int sem_trywait(sem_t *sem)
  {
      UINT32 ret;
  
      if ((sem == NULL) || (sem->sem == NULL)) {
          errno = EINVAL;
          return -1;
      }
  
      ret = LOS_SemPend(SemaphoreGetId(sem), LOS_NO_WAIT);
      if (map_errno(ret) == ENOERR) {
          return 0;
      } else {
          if ((errno != EINVAL) || (ret == LOS_ERRNO_SEM_UNAVAILABLE)) {
              errno = EAGAIN;
          }
          return -1;
      }
  }
  
  int sem_timedwait(sem_t *sem, const struct timespec *timeout)
  {
      UINT32 ret;
      UINT32 tickCnt;
  
      if ((sem == NULL) || (sem->sem == NULL)) {
          errno = EINVAL;
          return -1;
      }
  
      if (!ValidTimespec(timeout)) {
          errno = EINVAL;
          return -1;
      }
  
      tickCnt = OsTimespec2Tick(timeout);
      ret = LOS_SemPend(SemaphoreGetId(sem), tickCnt);
      if (map_errno(ret) == ENOERR) {
          return 0;
      } else {
          return -1;
      }
  }
  
  int sem_post(sem_t *sem)
  {
      UINT32 ret;
  
      if ((sem == NULL) || (sem->sem == NULL)) {
          errno = EINVAL;
          return -1;
      }
  
      ret = LOS_SemPost(SemaphoreGetId(sem));
      if (map_errno(ret) != ENOERR) {
          return -1;
      }
  
      return 0;
  }
  
  int sem_getvalue(sem_t *sem, int *currVal)
  {
      INT32 val;
  
      if ((sem == NULL) || (sem->sem == NULL) || (currVal == NULL)) {
          errno = EINVAL;
          return -1;
      }
      val = SemaphoreGetCount(sem);
      if (val < 0) {
          val = 0;
      }
  
      *currVal = val;
      return 0;
  }
  
  sem_t *sem_open(const char *name, int openFlag, ...)
  {
      (VOID)name;
      (VOID)openFlag;
      errno = ENOSYS;
      return NULL;
  }
  
  int sem_close(sem_t *sem)
  {
      (VOID)sem;
      errno = ENOSYS;
      return -1;
  }
  
  int sem_unlink(const char *name)
  {
      (VOID)name;
      errno = ENOSYS;
      return -1;
  }
  
  #ifdef __cplusplus
  #if __cplusplus
  }
  #endif /* __cplusplus */
  #endif /* __cplusplus */
  